BALTIMORE, June 30. — The American of this morning publishes the following:
A portion of the 1st Delaware cavalry, which was stationed at Westminster, 29 miles from the city, was attacked yesterday, and a running fight ensued, in which our cavalry was chased to within five miles of the city, but few of them reporting at headquarters.
Later in the evening it was ascertained that a considerable force of rebel cavalry was advancing towards the city on the Kiestertown road. The preconcerted signal was immediately given, and the members of the Union league promptly assembled and received their arms and marched to the barricades.
The American also says: "We are gratified to be able to announce that the army of the Potomac is in rapid and successful motion under the new commander. The character of this movement is such as will satisfy the country of the vigor, skill and good judgment of the new commander. We feel that we ought not to explain this grand movement in its present stage, but we assure our readers that it will give great satisfaction."
PHILADELPHIA, June 30, 2 P. M.: — Intelligence has been received to-day that Lee and stuff were at Carlisle last night.
A rebel infantry force was seen this morning about fourteen miles from Harrisburg, marching towards that city.
The telegraph wires are uninterrupted along the whole line of the Pennsylvania Railroad. The trains are running also, but slowly, to avoid surprise.
HARRISBURG, June 30, 1 P. M. — The city is quiet. There is no excitement. The colliers are all at their posts.
Yesterday 400 cavalry belonging to Col. Pierce's command, late Milroy's, had a fight with Imboden's cavalry at McConnellsburg, defeating them and driving them through that town. The rebels had three killed. On our side two were wounded. We took 33 prisoners.
The rebel division of Gen. Early left for York this morning, taking the road to Carlisle.
Gen. Lee is now concentrating his army in the valley between Shippensburg and Chambersburg, evidently anticipating an attack from the army of the Potomac.
Gen. Ewell's rebel corps is still in front of Harrisburg, and may commence the attack at any time.
PHILADELPHIA, June 30 — 3:15 P. M. — A dispatch from Harrisburg, received this morning, states that the authorities of Harrisburg have information, apparently reliable, that Ewell's corps, with a portion of Hill's and Longstreet's, will move to-day towards Harrisburg. They number about 40,000 men.
COLUMBIA, Pa., June 30. — H. S. Blair, trainmaster on the Northern Central Road, left York at 9 o'clock this morning, when the rebels has all left except their rear guard, which was beginning to move off when he left.
The rebels are supposed to be moving towards Harrisburg. They left unexpectedly and in a hurry.
It was reported that Gen. Pleasanton's outer pickets had been seen within four miles of York.
The total demand on York by the rebels amounted to $300,000. The citizens raised $30,000 in cash and subsistence, and the rebels allowed them 20 days to raise the balance. No private families were molested. The citizens were all treated with respect. The railroad property was not disturbed, with the exception of about 20 old cars, which were at the shops awaiting repairs. The railroad south of Glen Rock was not injured in any way. The rebel force at York was not over 8,000, with 18 pieces of artillery. Their force at Wrightsville was 3,000, with field pieces and artillery.
CHICKASAW BAYOU, June 25, VIA CAIRO, June 30. — Port Hudson is not taken. Gen. Grant was deceived by false report given out before the boat landed.
The Arizona was the vessel that arrived on Tuesday night, having passed around Port Hudson by the Atchafalaya.
Gen. Sherman left in command of a reconnoissance towards Canton.
Firing has been quieter to-day in consequence of the intense heat.
We have gained possession of another fort on the left.
There is a general impression that the siege must close before many days.
NEW YORK, June 29. — A Harrisburg special to the World says it is reported that Ewell's force, over 25,000, is withdrawing in the direction of York. It looks as if the whole rebel army meant to operate immediately against Baltimore.